t5548: add porcelain push test cases for dry-run mode
New dry-run test cases:
- git push --porcelain --dry-run
- git push --porcelain --dry-run --force
- git push --porcelain --dry-run --atomic
- git push --porcelain --dry-run --atomic --force
Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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